Do organic and other exotic superconductors fail universal scaling relations?

TL;DR

This paper demonstrates that apparent violations of universal scaling relations in superconductors, especially organic ones, are due to inconsistent data collection methods, and when standardized, all follow the same fundamental laws.

Contribution

The study shows that discrepancies in scaling relations are caused by varied experimental techniques, and confirms universality across all superconductor families with consistent data collection.

Findings

Organic superconductors follow universal scaling when measured on the same sample.

Inconsistent experimental methods lead to perceived violations of scaling relations.

All studied superconductors adhere to universal scaling relations with standardized data.

Abstract

Universal scaling relations are of tremendous importance in science, as they reveal fundamental laws of nature. Several such scaling relations have recently been proposed for superconductors; however, they are not really universal in the sense that some important families of superconductors appear to fail the scaling relations, or obey the scaling with different scaling pre-factors. In particular, a large group of materials called organic (or molecular) superconductors are a notable example. Here, we show that such apparent violations are largely due to the fact that the required experimental parameters were collected on different samples, with different experimental techniques. When experimental data is taken on the same sample, using a single experimental technique, organic superconductors, as well as all other studied superconductors, do in fact follow universal scaling relations.